martin



(No Model.) I

W. A. MARTIN.

I LOOK.

No. 407,738. Patented July 23, 1889.

W. a1: H

NITED STATES PATENT OFFICE.

\VASHINGTON A. MARTIN, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-FOURTH TOI-IEN RY REUTER, OF SAME PLACE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 407,738, dated July 23,1889.

Application filed March 6, 1889. Serial No. 302,161. (No model.)

To all whom it may concern- Be it known that I, AsHINoToN A. MAR- TIN,of the city of Chicago, in the county of Cook and State of Illinois,have invented cer- 5 tain new and useful Improvements in Locks andLatches, of which the following is a specification.

In order to enable others skilled in the art to which my inventionpertains to make and use the same, I will now proceed to describe it.

In the ordinary latch which automatically enters into engagement whenthe door is closed the bolt is beveled, so as to be thrown back by theclosing of the door, or else there is a pivoted piece which is thusswung back and throws back the bolt at the same time. In either of theseconstructions the bolt can be thrown back and the door unlatched byforcing in a thin knife-blade or other instrument. By my invention Iovercome this objection, and I do this by using a square bolt, which isnormally withdrawn when the door is open and is automatically tripped bythe closing of the door; and my invention consists in that arrangementand in certain other devices or combinations, as specified in the claimsat the end hereof.

In the accompanying drawings I have rep resented a latch and lockcontaining my in- 'vention.

In the drawings, Figure 1 is an elevation showing a part of a closeddoor and its jamb with the complete device applied. Fig. 2 is anelevation of the lock and latch with the bolt drawn back, thecovering-plate having been removed to show the interior parts. Fig. 3 isthe same, but with the bolt projected. Fig. 4 is a section through A A,Fig. 2. Fig. 5 is a section through 13 B, Fig. 4. Fig. 6 is a sectionthrough C C, Fig. 5. Fig. 7 is a view of the trigger for tripping thebolt.

In the accompanying drawings, 1 is a door.

. 2 is the jamb: 3 is the casing of the lock and latch.

at is the socket secured to the jamb, with which the bolt engages.

5 is the bolt.

- 6 is a spring to shoot the bolt.

7 is a yoke constituting that portion of the bolt within the case.

8 is a stem to hold spring 6 in place.

9 is a lug on the case against which spring 6 bears. The spring thustends to force the bolt outward.

10 is a lug on the yoke 7..

1]. is an arm pivoted in the case at&

i3 is a pin or dog on the free end of afinll. By the swinging of the armpin 13 is caused to engage luglO, and thus lock the bolt back.

14 is the trigger. Its back end is flattened 6c into a sliding plate 15,and is provided with a diagonal slot 16, through which pin 13 projects.

17 is a spring which throws the trigger in the position shown in Fig.2,and thereby throws the dog into engagement with lug 1Q.

The projecting end of the trigger is beveled, as shown at 18. Thus, theparts being in the position shown in Fig. 2,if the door be closed thetrigger is forced back, and thereby moves pin 13 out of engagement withlug 10, and the bolt is projected by spring 6 and locks the door.

19 is a cam within yoke. '1, which may be turned to force back the boltand unlock the door. For this purpose the cam engages a shoulder 2 0 onthe yoke Z- When the bolt is projected, a spring 21 throws the cam tothe position shown in Fig. 3 and locks the bolt in that position.

22 is a knob by which the camflflis turned.

23 is the cam pivot or arbor, to one end of which knob the spring 21 isattached. The end of the arbor 22 opposite the knob is forked to engagea shank 2a of a Yale or any other suitable lock 28 operated by a key.

25 is a hook pivoted at 26, which hooks over cam 19, as indicated inFig. 2, and thereby retains the bolt in its retractedposition.

27 is a knob for operating the hook 25. 0

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. The combination, substantially as set forth, of the bolt providedwith a lug, as 10, the swinging pin or dog to engage said lug and tohold the bolt back, and the trigger In testimony whereof I have hereuntoset provided with an oblique slot, as 16, to throw my hand and affixedmy seal, at Chicago, Illithe dog and release the bolt. nois, this 2d dayofMarch, 1889.

2. The combination, substantially as set 5 forth, of the bolt, the (log,the trigger, the WASHINGTON A. MARTIN. [n s] cam to retract the bolt,the cam-arbor having a forked end, and a key-operated look, as 28, Inpresence of in engagement With said cam-arbor, all ar- DANL. A. RAY,

ranged and operating substantially as shown CHAS. O. TILLMAN. 10 anddescribed.

